导流隧洞衬砌混凝土温度应力围岩变形模量敏感性分析

Sensitivity Analysis to Thermal Stress of Surrounding Rock Deformation Modulus for Diversion Tunnel Lining Concrete

针对溪洛渡水电站导流洞衬砌混凝土工程,采用三维有限元法分析了围岩变形模量变化对温度应力影响的敏感性。实例表明,围岩变形模量是影响温度应力的重要因素,围岩变形模量大,早期拉应力略小,后期拉应力明显增大,温控防裂措施严格,为实际工程提供了参考依据。

In view of the lining concrete engineering of Xiluodu hydropower station, 3-dimensional finite element method is used to analyze thermal stress sensitivity of the surrounding rock deformation modulus. The results show that rock deformation modulus of the surrounding rock is a major factor for influence thermal stress. Thermal stress is slightly small in the early stage and it increases obviously in the later when surrounding rock deformation modulus is much. Temperature control measure for preventing the crack is adopted strictly to provide the valuable reference for practice engineering.